I'm short some important details on this one, but hopefully can fill in more shortly. We're seeing poor performance (very slow download speeds -- < 100KB/sec) to certain EC2 instances via our Verizon hosted circuits. The issue is reproducible on both our production Gigabit circuit as well as a consumer grade Verizion FIOS line. Speeds are normal (10MB/sec plus) via non-Verizon circuits we've tested. Source IP's are in the 198.102.62.0/24 range and destination on the EC2 side is 54.197.239.228. I'm not sure in which availability zone the latter IP sits, but hope to find out shortly. MTR traceroute details are as follows: Host Loss% Snt Drop Avg Best Wrst StDev 1. 198.102.62.253 0.0% 526 0 0.2 0.2 0.5 0.0 2. 152.179.250.141 0.0% 526 0 14.1 7.0 19.4 3.6 3. 140.222.225.135 37.5% 526 197 7.7 6.8 35.8 1.9 4. 129.250.8.85 0.0% 526 0 8.1 7.4 11.7 0.3 5. 129.250.2.229 10.3% 525 54 11.4 7.1 85.7 9.6 6. 129.250.2.169 41.5% 525 218 63.0 45.5 130.7 10.3 7. 129.250.2.154 0.2% 525 1 59.9 44.5 69.0 4.0 8. ??? 9. 54.240.229.96 7.8% 525 41 76.6 71.3 119.9 8.6 54.240.229.104 54.240.229.106 10. 54.240.229.2 6.9% 525 36 74.7 71.6 109.1 4.9 54.240.229.4 54.240.229.20 54.240.229.8 54.240.229.14 54.240.228.254 54.240.229.16 54.240.229.10 11. 54.240.229.174 5.5% 525 29 76.0 71.7 109.0 7.3 54.240.229.162 54.240.229.160 54.240.229.170 54.240.229.172 54.240.229.168 54.240.229.164 12. 54.240.228.167 94.5% 525 495 76.4 71.7 126.0 11.6 54.240.228.169 54.240.228.165 54.240.228.163 13. 72.21.220.108 5.1% 525 27 75.2 71.3 112.6 6.8 205.251.244.12 72.21.220.8 205.251.244.64 72.21.220.96 205.251.244.8 72.21.220.6 205.251.244.4 14. 72.21.220.45 9.0% 525 47 74.0 71.6 199.5 8.5 72.21.220.149 72.21.220.29 72.21.220.125 72.21.220.37 72.21.220.61 72.21.220.2 72.21.220.69 15. 72.21.222.33 10.5% 525 55 73.4 71.5 87.1 1.5 205.251.245.65 72.21.222.149 72.21.222.35 72.21.220.29 72.21.222.131 72.21.222.147 72.21.220.37 16. 205.251.245.65 93.9% 525 492 73.1 72.2 76.2 1.2 72.21.222.35 72.21.222.131 17. ??? 18. ??? 19. 216.182.224.79 13.5% 524 71 77.9 72.4 101.2 5.4 216.182.224.81 216.182.224.95 216.182.224.77 20. 216.182.224.81 94.1% 524 492 77.9 72.8 93.0 6.3 216.182.224.95 216.182.224.77 21. ??? The 140.222.225.135 shows up in the traceroutes via our Verizon Business FIOS line as well. Will be opening a ticket with both Verizon and AWS to assist, but hoping someone out there can take a look or chime in. Feel free to reply off list. Thanks, Ray